Am' jm 'iStarm" }  A  n  Improved  Pestle.  2  5 
wedgewood  head  has  two  vertical  grooves,  of  which  the  cut  shows 
one,  running  down  on  opposite  sides  to  a  countersunk  groove  at 
right  angles  to  the  other  two.  This  groove  runs  around  on  the 
inside  at  about  half  the  height  of  the  head,  and  is  just  large  enough 
to  permit  of  the  complete  turning  of  the  head  of  the  screw.  The 
shank  is  oval,  and  has  a  sliding  nut,  which  falls  into  the  grooves  in 
the  pestle  head  when  the  screw  has  been  turned  sufficiently.  The 
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nut  when  in  place  prevents  the  turning  of  the  screw.  The  oak 
handle  is  tapped  out  to  receive  the  screw,  and  has  a  projection 
which  fits  into  a  circular  opening  in  the  pestle  head,  thereby  making 
the  joint  more  stable.  In  joining  the  head  and  the  handle  the 
sliding  nut  must  be  lifted  up  and  placed  at  right  angles  to  the  screw 
head.  The  screw  is  then  placed  over  the  wedgewood  head,  so  that 
the  angles  on  the  head  of  the  screw  come  in  line  with  the  grooves 
